X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2Fdraw%2Fao_line.c;h=14e1a3c1a591aec6b2cdc5341e08f57d2e01fca2;hb=14f1e175af85c0ef4539316d5ce049798a878fcb;hp=832a916c76aed9dbe1042f7a024febe071ae93c6;hpb=4fa489276826e33fa5e21d0a94a8ed3e29ebcfd0;p=fw%2Faltos

diff --git a/src/draw/ao_line.c b/src/draw/ao_line.c
index 832a916c..14e1a3c1 100644
--- a/src/draw/ao_line.c
+++ b/src/draw/ao_line.c
@@ -12,8 +12,8 @@
  * General Public License for more details.
  */
 
-#include "ao_draw.h"
-#include "ao_draw_int.h"
+#include <ao_draw.h>
+#include <ao_draw_int.h>
 
 #define ao_mask(x,w)	(ao_right(AO_ALLONES,(x) & AO_MASK) & \
 			 ao_left(AO_ALLONES,(FB_UNIT - ((x)+(w))) & AO_MASK))
@@ -211,16 +211,20 @@ ao_clip_line(struct ao_cc *c, struct ao_cbox *b)
 	 */
 	int32_t	adj_min;
 
-	if (!c->first)
-		adj_min = div_ceil(c->e + adjust_major * c->e1, -c->e3);
-	else
-		adj_min = div_floor_plus_one(c->e + adjust_major * c->e1, -c->e3);
+	if (c->e3) {
+		if (!c->first)
+			adj_min = div_ceil(c->e + adjust_major * c->e1, -c->e3);
+		else
+			adj_min = div_floor_plus_one(c->e + adjust_major * c->e1, -c->e3);
+	}
 
 	if (adj_min < adjust_minor) {
-		if (c->first)
-			adjust_major = div_ceil(c->e - adjust_minor * c->e3, c->e1);
-		else
-			adjust_major = div_floor_plus_one(c->e - adjust_minor * c->e3, c->e1);
+		if (c->e1) {
+			if (c->first)
+				adjust_major = div_ceil(c->e - adjust_minor * c->e3, c->e1);
+			else
+				adjust_major = div_floor_plus_one(c->e - adjust_minor * c->e3, c->e1);
+		}
 	} else {
 		adjust_minor = adj_min;
 	}
@@ -230,11 +234,12 @@ ao_clip_line(struct ao_cc *c, struct ao_cbox *b)
 	c->major = (int16_t) (c->major + c->sign_major * adjust_major);
 	c->minor = (int16_t) (c->minor + c->sign_minor * adjust_minor);
 
+	c->first = true;	/* signal to extend len */
 	return true;
 }
 
 void
-ao_line(const struct ao_bitmap	*dst,
+ao_line(struct ao_bitmap	*dst,
 	int16_t			x1,
 	int16_t			y1,
 	int16_t			x2,
@@ -320,10 +325,17 @@ ao_line(const struct ao_bitmap	*dst,
 	if (adx > ady) {
 		x1 = clip_1.major;
 		y1 = clip_1.minor;
+		x2 = clip_2.major;
+		y2 = clip_2.minor;
 	} else {
 		x1 = clip_1.minor;
 		y1 = clip_1.major;
+		x2 = clip_2.minor;
+		y2 = clip_2.major;
 	}
+
+	ao_damage(dst, ao_min16(x1, x2), ao_max16(x1, x2), ao_min16(y1, y2), ao_max16(y1, y2));
+
 	ao_bres(dst,
 		signdx,
 		signdy,